Organic (Non Geological)

Browse organic (non geological) specimens identified by the Rock Identifier community.

Pyrite

Pyrite (Iron Disulfide), FeS2

Mineral

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Metamorphic Rock

Synthetic Costume Glove (Paws)

Polyethylene terephthalate (Polyester) & Polyurethane blend

Non-geological / Man-made textile

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

sedimentary

Amber (Copal)

Organic gemstone, fossilized tree resin (often immature amber or copal)

Mineral

Mother of Pearl (Nacre)

Calcium Carbonate (primarily aragonite, with conchiolin)

Organic Gemstone/Biomineral

Graphite-veined Quartzite

Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)

metamorphic

Granite

Granite (Felsic intrusive igneous rock)

igneous

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Sedimentary Rock

Pink Anthracite Coal (dyed)

Anthracite Coal (Artificially Colored)

Sedimentary Rock (Altered)

Shale

Shale (clastic sedimentary rock)

Sedimentary

Petrified Wood

Silicified wood (primarily SiO2)

sedimentary

Sea Glass (White/Clear)

Amorphous Silica (Alkali-Lime-Silica Glass), SiO2 + Na2O + CaO

Anthropogenic (Man-made product subject to geological processes)

Red Jasper (beads)

SiO₂ (Silicon Dioxide)

Mineral, variety of chalcedony (microcrystalline quartz)

Dendritic Agate (or Dendritic Opal)

SiO2 (for Agate), SiO2·nH2O (for Opal)

Mineral

Popcorn

Zea mays everta (P. Wilson) (Botanical name for the corn variety)

Organic/Biogenic

Pyrite

Pyrite (Iron Disulfide), FeS2

Mineral

Brown Jasper (Likely)

Jasper (Cryptocrystalline Silicon Dioxide - SiO2)

Mineral

Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)

SiO₂ (silicon dioxide)

Sedimentary

Banded Chert

Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)

Sedimentary

Fossilized Wood (Petrified Wood)

Silicified Wood (primarily quartz/chalcedony replacing organic matter)

Sedimentary (with some aspects of mineral replacement)

Chert / Flint

Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂

Mineral

Hand-Drawn Gengar Pokémon Card Artist Item

Lignocellulosic Fiber (Cellulose, C6H10O5) with wax-based pigment (crayon/colored pencil)

Organic (Paper and Cellulose)

Banded Gneiss

Gneiss (pronounced "nice")

metamorphic

Pearl

Calcium Carbonate (Aragonite or Calcite) and Conchiolin

Mineraloid

Peridot

Olivine (Mg,Fe)2SiO4

Mineral

Peridot (likely, given the color and bead form)

Olivine, variety Peridot (Mg,Fe)2SiO4

Mineral

Dog (Sleeping)

Canis familiaris (or Canis lupus familiaris)

Organic/Biological

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Synthetic (glass)

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Metamorphic Rock

Hematite

Hematite (Fe2O3)

mineral

Ambergris

Ambrein (C30H52O)

mineraloid / organic geological substance

Laterite

Laterite (no specific mineral formula as it's a rock type)

Sedimentary

Mica Group Minerals

There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).

Mineral